S&W 646 conversion to 10mm about to begin

[jcjacobvt]

You do know that there are other runs in the works for more S&W 610 10mm revolvers, available later this year?

 

[Newguy1]

I am looking for a "donor" GP100 or a 686 to modify to 10mm/40 S&W. I am going to have Clements Custom do the conversion.

 

[Gator]

That won't work. 696 has .429 chambers. 646 has .401.

Which is why they would need to be sleeved.

 

[JohnL2]

You do know that there are other runs in the works for more S&W 610 10mm revolvers, available later this year?

(Down on my knees; arms reaching up to the heavans)
YESSSSSSSSSS!!!!

 

[Combat Controller]

Well, I don't want to mess with hot .40 loads, as I don't really care for the round. I have other 10mm guns, and light loads, or winchester are fine for carry. It is a 10mm after all. This way I can swap out from carbine, to 610, to Delta Elite to 646. I talked to the smith today who did the conversion of the other 646, and he told me to send the gun. It is $15 per chamber including polishing and whatnot, he asked for the whole gun to check headspace. I think I will have him put in a tritium front sight while he is at it.

 

[Seven For Sure]

That sounds very reasonable. Good luck with it and please let us know how it turns out.

 

[Combat Controller]

I will do so!

 

[Combat Controller]

It is done! I just got back my bored out 646 .40 S&W revolver. It now accepts 10mm cartridges. What little I could garner from the internets told me at least one person has done this, possibly two. I used the same gunsmith and I am going to follow the advice I was given about pressure. The 10mm can spike up into the 40k psi range, and the gun is only rated for a 36k psi .40 cartridge. The Winchester Silver Tip 175 gr is supposed to shoot well in this gun and at 33k psi, should be safe. I am hesitant to develop a handload for it, and just go with the more costly, but lower pressure commercial load.

Here it is compared to my other two 10mm revolvers, a 5" and a 3" lew horton 610. Notice it is much smaller than the N frame 3" and should be easier to pack. As it is the same size as my pythons (and other S&W's), I can use the holsters with no problems. It is not a snub nosed gun, but I may tackle that one at some point, but it will require a Ruger and a lot of heavy custom work. So, for the time being, I am going to try and convince my gunsmith to make me a custom 1911 CCO in 10mm. He is hesitant, but heck, it's my money!

 

[Seven For Sure]

Awsome. I have two 646's. One NIB with a non fluted SS 686 cylinder waiting for conversion. A 10mm, L frame S&W revolver without the lock. What more could a guy ask for? You should try talking to these guys and ask them if they have any low pressure loads. Good shooting!
www.doubletapammo.com
www.reedsammo.com

 

[Combat Controller]

I plan on it, thanks!